The following table shows the average rice yield Y, in tons per hectare, on Asian farms t years after 1980. Use linear regression to model average rice yield as a function of years since 1980.
t 5 10 20 25Y 3.39 3.67 3.95 4.13?
?
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Solve the problem.A rescue cable attached to a helicopter weighs 2 lb/ft. A 200-lb man grabs the end of the rope and is pulled from the ocean into the helicopter. How much work is done in lifting the man if the helicopter is 30 ft above the water?
A. 6060 ft ? lb B. 6900 ft ? lb C. 7800 ft ? lb D. 1100 ft ? lb
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Find the derivative of the function.y = log |-4x|
A. - 
B. - 
C. 
D. 
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Evaluate the square root.
A. 256
B. 
C. 4
D. not a real number
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Solve the equation.log (x + 4) = log (4x + 1)
A. 
B. 1
C. 
D. - 1
Mathematics